Indoor Tent Issue Plz help

Hello everyone. Before I mention the issue that is occurring let me provide some background on my step up. First off, I'm a intermediate grower that normally grows hybrids and indica's. I decided to try a sativa this time around "Headband". I have a three stage step up. One clone/cuttings/seedlings which is not where I have the problem. The second stage is my veg room where I'm using two 400w bulbs and a DWC set up, ( here is where I'm having the problem). Then the third stage is my full blown set up, 1000w light, current DWC with mag pump, co2, chiller, ac unit, chh4 sentinel environment control, dehumidifier, etc... Now I received these clones from a dispensary that only focuses on clones. Unfortunately, they messed up my order because I do hydro and they gave me six clones in coco soil. First thing I did was flush the coco matter off the roots and transplanted them into rockwool cubes and began feeding them house of garden nutrients on the cutting/seeding recommended feeding, which you can find at this website http://www.house-garden.us/feed-charts/ it is the third one down, (aqua flakes, coco, hydro). The problem i'm noticing is the leaves are beginning to show yellow spots and I have never encountered this before. Now keep in mind, these plants are under a 400w light, which is roughly about 15 inches away. There are no pests or fungus on my plants, so spider mites aren't the reason for it. I have not spray my plants with and when I do it's always at night so its not water burn. I'm not sure if it is a deficiency or a nute burn. I do have pictures. When I first got them they didn't have this problem so it was just recent and very minimal right now but trying to figure out the problem so I can correct it. I also noticed the top of the main stem began turning a redish color for some reason as well, pleaseif anybody has any input on that as well. I placed the pictures in order from when I got them to when I transplanted them to when the problem began. View attachment 2684729 View attachment 2684723View attachment 2684721View attachment 2684722View attachment 2684727View attachment 2684728View attachment 2684726View attachment 2684725View attachment 2684724

Cal mag or N deficiency. Nutes? Water Temp? PH? EC? Also, when switching from a coco environment to hydro, there will be shock.

You got lock out. What is your ph at?

I'm going to say you have cal locked out which is locking up mag and some others.

Here take a look here.

http://www.growweedeasy.com/marijuana-symptoms-pictures

Yeah I figured there would be some shock with the plant, however, they actually faired well. The ph level is set at 5.8 but i'm going with the recommended instructions on the chart that was provided from house of garden. I was using flora nova nuts but switched to house of garden which indicated to keep the ph level at this range. Since this is my first sativa I figured to go that route and see the outcome. I really appreciate the help. I do have a cal-mag and I guess I will have to introduce it to the house of garden mixture. If there are any other suggestions I will greatly appreciate it.

Lower you ph to 5.3-5.5 and flush, then give a complete npk and then water for the next 2 feedings and see what happens.